Gheez mate, that guys was lucky. It could have killed him.
Happened when he cleaned the grill with a wire brush before the BBQ.
Good practice to wipe the grill after cleaning with some white paper towels.
I always do it with my right hand, 'cause the left one holds a beer!

The devil whispered, “You cannot withstand the storm“ and I replied: “I am the storm!”.....Unknown.